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Viva Questions:

1. What is Light Emitting Diode (LED)?
2. How it is different from Si/Ge diode?
3. How LED works?
4. In the photoelectric effect, a suitable frequency of photon falls on an electron in an atom and ejects the electron. In LED when electron-hole recombination takes place a photon emits. How do you see these two phenomena?

5. Why do you put equal two different energies like eV and hv, what is the condition for that?